Hi.

I have run into a problem with roll-up summaries.  Background is as follows:

- I set up a custom object with a roll-up summary of type MAX on a related Detail object.

- I initially did this in our sandbox, and then I deployed to production.  It works fine (both in production and in sandbox).

- I have now added a further couple of Detail objects attached to the same original master object in our sandbox.  I want to add a couple of new roll-up summary fields of type MAX related to the two new Detail objects.

- However, when I try to do so, on step 3 of 5 where you point to the summarised object and then select the roll-up type, the only option available is COUNT: the other options (SUM, MIN, MAX) are all greyed (or more accurately "pinked") out and can't be selected.

- I don't know why.  Also, if I go into the original roll-up summary that I had previously set up successfully, the same roll-up types are greyed out, with only COUNT available (although it still retains the MAX roll-up type that I had previously used).

I've haven't managed to find any useful help on this subject either within the help screens or in this forum, and I'm starting to feel like tearing my hair out!

Please help.

Thanks.

Roger.